Arrow key down loops back to first line

[MentalGear]

As a user, I would not expect that when pressing arrow key down on the last sentence, that the cursor would loop back to the first line.

Untitled.mov

(text breaking of layout in previous bug report)

[doodlewind]

Thanks for your feedback! Just wondering how did you enter the first line that is aligned to the left of the browser viewport? This may be an edge case for contenteditable that is not expected to be editable, cc @Flrande

[Flrande]

Need to wait for the reproduction of #6217

#6217 (comment)